US20170095764A1 - Filter medium - Google Patents
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- US20170095764A1 US20170095764A1 US15/279,163 US201615279163A US2017095764A1 US 20170095764 A1 US20170095764 A1 US 20170095764A1 US 201615279163 A US201615279163 A US 201615279163A US 2017095764 A1 US2017095764 A1 US 2017095764A1
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- United States
- Prior art keywords
- layer
- filter medium
- metal layer
- filtering material
- filtering
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- Abandoned
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/10—Filter screens essentially made of metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1692—Other shaped material, e.g. perforated or porous sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/14—Layered products comprising a layer of synthetic resin next to a particulate layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
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- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/04—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the partial melting of at least one layer
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- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/05—Interconnection of layers the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
- B01D2239/0668—The layers being joined by heat or melt-bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
- B01D2239/0681—The layers being joined by gluing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/08—Special characteristics of binders
- B01D2239/083—Binders between layers of the filter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2275/10—Multiple layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/02—2 layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/20—Inorganic coating
- B32B2255/205—Metallic coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/105—Metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/202—Conductive
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Geology (AREA)
- Filtering Materials (AREA)
Abstract
By, according to the invention, manufacturing a filter cloth (5, 6) especially to be used in filtering of gas flows, which filter is manufactured in a rolling mill where the individual layers are laminated with a membrane layer (1), to which by the use of a binder (2), such as thermoplastic sheeting, is glued a filter layer (4) with at least one metal layer (3, 13). Hereby is achieved a robust laminate (5, 6), which is, in addition, easy to manufacture in a rolling mill with heated rollers for melting of the binder (2).
Description
- The present invention relates to a filter medium especially a filter cloth for removal of particles from gas flows such as air, smoke and residual gasses, which medium comprises a gas permeable laminate, method for manufacture and use.
- Removal of particles from gas flows is an important element, partly by controlling the emission of noxious particles and partly by capturing particles, possibly for the purpose of reusing.
- Known in the art are filtering medias built around a PTFE film layer, which functions as a membrane, on which on either side or both sides is glued a filtering material using liquid glue.
- However, this filter medium is not very robust as the glue is unable to tie the layers sufficiently, so that just a slight impact may cause damage to the medium and thereby destroy its filtering ability.
- Dust separation usually takes place in bag filter elements, filter elements with a specified porosity. However, there is a tendency to create an electrostatic field in the filter which may pose a risk of personal injury and fire, explosion hazard.
- To remedy this are prior art filter media with inlaid metal layers, which can be electrically grounded/frame grounded for discharge/removal of this electrostatic current through the metal layer.
- An example of such a prior art medium is U.S. Pat. No. 4,531,957 which comprises a perforated laminate (30) consisting of a perforated plastic sheeting (32), which is fitted with a surface layer (34) of a metal coating, e.g. of aluminium.
- The disadvantage of this metalized filter medium is partly that the metal layer requires perforation to become gas permeable and partly that it is unprotected and thus exposed to damage by handling, assembly.
- This of course reduces the conductive effect and thereby the electrostatic discharge, which is either interrupted or at least has only partial discharge.
- It is the object of the invention to improve the filter medium to achieve the best possible filtering efficiency without the risk of delaminating the medium or damaging the surface.
- This is achieved according to the invention by a filter medium where the laminate consists of a membrane layer to which the filtering material is glued using a thermoplastic binder such as a polyester sheeting.
- In this surprisingly simple way is achieved a robust medium, as well as a simplification of the manufacture, as the binder is activated during the heating and compression in the same operation in a rolling mill. Hereby is achieved a manufacturing simplification, as the binder only becomes liquid when the layers are in their right relative positions.
- By, as described in
claim 2, having the laminate consisting of a membrane layer to which is glued a filtering material with a metal layer, is achieved an efficient discharge, as the metal layer is protected and thereby ensures that this metal layer is not directly exposed, as well as the layer having an appropriate gas permeability. - By, as described in
claim 3, gluing an additional metal layer on the outside, additional electrical discharge is ensured as the metal layer in a simple way can establish contact between the metal layer and the frame/ground. - By, as described in
claim 4, using a corrugated laminate the gas permeation can be ensured, as the binder primarily will adhere to wave crests and thereby leaves channels for the gas permeation. - By using the method described in claim 5, the medium can be manufactured at a low production cost and in well-known manufacturing equipment.
- Finally, a filter medium, as described in claim 6, is suitable for filtering of particles down to 0.1 μm.
- Examples of embodiments of laminates according to the invention will be described in detail in the following with reference to the drawing where
-
FIG. 1 shows a sectional drawing of a non-conductive filter medium, and -
FIG. 2 shows a sectional drawing of a conductive filter medium - An example of a filter medium according to the invention is shown in the sectional drawing in
FIG. 1 , section A, while the single layers are shown in section B. - The membrane layer 1 is usually of a certain PTFE sheeting, on which the
filter layer 4 is glued using a bindinglayer 2, which according to the invention consists of a polyester sheeting, which is thermoplastic. - In the manufacture of this medium in a rolling mill, the
binder layer 2 can be made liquid at the same time as the rollers compress the laminate. - This medium is very robust and will not as easily be damaged, thus ensuring a uniform filtering ability.
- In
FIG. 2 is shown an example of a filter medium with a filteringmaterial 4 with one or twometal layers layers metal coating - Where there is no need for the
outer metal layer 13, this can of course be omitted. - The metal layer can preferably consist of aluminium in the form of aluminium powder of the size of 200 microns, which by means of a vacuum are sucked firmly to the filtering material.
- As shown in section B this laminate comprises a membrane 1, which for example can be a PTFE sheeting. This membrane 1 comprises the membrane layer in the laminate 5, so that the strength and gas permeation qualities of the cloth can be dimensioned accordingly.
- Hereafter follows a
binder layer 2, which consists of a thermoplastic polyester sheeting. The purpose of this binder layer is to adhere the filteringmaterial - The
metal layer 3 consists of, for example, a more or less porous aluminium layer in the form of aluminium powder, which may be corrugated, i.e. wave shaped, in appropriate parallel waves. The wave length could, for example, be 5 mm and the wave height around 1 mm. - As the metal layer is appropriately porous the gas permeation is thus securely kept at the desired level.
- If an
outer metal layer 13 is needed, anouter metal layer 13 can, as previously explained, be coated. - The manufacture of the medium is done with a heated rolling to ensure melting of the
polyester sheeting 2, where the layers are assembled to form the finished laminate 5 shown in section B, which comprises the filter medium, - The laminate can be manufactured for filtering of particles dependent on the gas permeation of the individual layers, porosity.
- Furthermore, it will be suitable for dust separation of particles down to 0.1 μm,
- As the laminate can be manufactured using prior art technology and in prior art rolling mills, it can be manufactured at very competitive production costs, since no further extraordinary expensive components are included.
Claims (10)
1-6. (canceled)
7. A filter medium for removing particles from gas flows, the filter medium comprising a gas permeable laminate comprising a membrane layer to which a filtering material is glued via a thermoplastic binder.
8. The filter medium of claim 7 , wherein the membrane layer is glued to the filtering material via a first metal layer.
9. The filter medium of claim 8 , wherein the filtering material is glued to a second metal layer on an outer side of the filtering material.
10. The filter medium of claim 7 , wherein the laminate comprises a corrugated wave shape.
11. A method for manufacturing a filter medium for removing particles from gas flows, comprising applying a thermoplastic polyester layer between a membrane layer and a metal layer, wherein applying the thermoplastic polyester layer comprises heating the thermoplastic polyester layer to its melting point and rolling the thermoplastic polyester layer with at least one of the membrane layer and metal layer.
12. The method of claim 11 , comprising applying a second thermoplastic polyester layer between the metal layer and a filtering material, wherein applying the thermoplastic polyester layer comprises heating the thermoplastic polyester layer to its melting point and rolling the thermoplastic polyester layer with at least one of the metal layer and the filtering material.
13. The method of claim 11 , wherein at least a portion of the filter medium has a corrugated, wave shape.
14. A method of using a filter medium to remove particles from a gas flow, comprising:
providing a filter medium comprising a gas permeable laminate comprising a membrane layer to which a filtering material is glued via a thermoplastic binder; and
filtering a gas flow with the filter medium,
wherein filtering comprises filtering particles down to 0.1 μm.
15. The method of claim 14 , wherein the membrane layer is glued to the filtering material via a first metal layer.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DKPA201500613 | 2015-10-06 | ||
DKPA201500613 | 2015-10-06 |
Publications (1)
Publication Number | Publication Date |
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US20170095764A1 true US20170095764A1 (en) | 2017-04-06 |
Family
ID=57083057
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/279,163 Abandoned US20170095764A1 (en) | 2015-10-06 | 2016-09-28 | Filter medium |
Country Status (4)
Country | Link |
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US (1) | US20170095764A1 (en) |
EP (1) | EP3153313A1 (en) |
CN (1) | CN106955529A (en) |
CA (1) | CA2944311A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109621748A (en) * | 2019-01-07 | 2019-04-16 | 浙江净膜环保有限责任公司 | The preparation method of low-resistance coated filter material |
CN109647054A (en) * | 2019-01-07 | 2019-04-19 | 浙江净膜环保有限责任公司 | Laminating base fabric filtrate |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US3444925A (en) * | 1957-05-07 | 1969-05-20 | Minnesota Mining & Mfg | Structural articles and method of making |
US20020119325A1 (en) * | 1999-09-13 | 2002-08-29 | Park Sung-Soon | Composition and method for a coating providing anti-reflective and anti-static properties |
US20140150658A1 (en) * | 2012-12-04 | 2014-06-05 | Xavier Rex Prax | Hvac filtration system |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US4531957A (en) | 1984-01-13 | 1985-07-30 | Abdul Malik | Filtering material and filtration apparatus employing the filtering material |
US5527569A (en) * | 1994-08-22 | 1996-06-18 | W. L. Gore & Associates, Inc. | Conductive filter laminate |
CN1170370A (en) * | 1995-10-23 | 1998-01-14 | W·L·戈尔及同仁股份有限公司 | Conductive filter laminate |
JP3273735B2 (en) * | 1996-05-17 | 2002-04-15 | 日東電工株式会社 | Polytetrafluoroethylene porous membrane and method for producing the same, sheet-like polytetrafluoroethylene molded article, and filter medium for air filter |
JP2000176262A (en) * | 1998-12-11 | 2000-06-27 | Daikin Ind Ltd | Porous material, filter material for air filter, air filter unit, and supporting material for filter material for air filter |
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2016
- 2016-09-08 EP EP16187875.6A patent/EP3153313A1/en not_active Withdrawn
- 2016-09-28 US US15/279,163 patent/US20170095764A1/en not_active Abandoned
- 2016-09-30 CN CN201610875201.5A patent/CN106955529A/en active Pending
- 2016-10-05 CA CA2944311A patent/CA2944311A1/en not_active Abandoned
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US20020119325A1 (en) * | 1999-09-13 | 2002-08-29 | Park Sung-Soon | Composition and method for a coating providing anti-reflective and anti-static properties |
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Also Published As
Publication number | Publication date |
---|---|
EP3153313A1 (en) | 2017-04-12 |
CA2944311A1 (en) | 2017-04-06 |
CN106955529A (en) | 2017-07-18 |
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Legal Events
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AS | Assignment |
Owner name: JP AIR TECH APS, DENMARK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:POULSEN, JORGEN;REEL/FRAME:039880/0798 Effective date: 20160922 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |